a(n) = product{k=1 to n} (k-th integer from among those positive integers which are coprime to (n+1-k)).
A130767
a(n) = product{k=1 to n} (k-th integer from among those positive integers which are coprime to (n+1-k)).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =40a(4) =420a(5) =2700a(6) =56595a(7) =419328a(8) =8820900a(9) =88488400a(10) =2327925600a(11) =38767286880
External references
- oeis: A130767